How to find bios version?

Hey, im a newbie to the PS2 modding scene, but have past experience with the xbox. I was just wondering if someone could explain to me how to find out the bios version of my PS2, i believe its a version 1-3, and i just ordered a magic 3.1 plus chip thats on the way, thanx for the help.

In order to find your BIOS version, boot up your PS2 with no disc and no memory card. You'll be taken to your system configuartion screen. Choose:
CONFIGURATION
hit "O"
It should be there in a nice little list.

If your PS2 doesn't boot or you just don't feel like doing the above, can you write in the following - all of which is located on the rear of the unit?
Model #: SCHP:
Serial#: First two digits ONLY
Date Code: Towards the bottom of the label, it will usually have one letter and one number.

hey, i tried to get into the configuration screen, but can't seem to get it to work, im not sure why. is there any other way of doing this, or maybe could u give me more details if at all possible? the info requested before is:
SCPH-30001
S/N- U23 ( didnt know if letter meant digit)
DC- 1A

hey, i was looking under the directions for installing the modchip and for version three the only option is the 020 bios, but it has gap and not gap. Also before the bios number it has GH004, or GH005-7, is this number part of the bios, or perhaps a model fo the chip? I am not home right now so i will check my ps2 when i get home for thebios but i was jw about that, thanx.

it is a us version.
GH004, GH005, GH006, GH007 are all on there, heres the link to it, just click on magic 3.1 plus. http://www.mod-chip.com/directions.htm
As for under version on my ps2 all i see is console, the driver info, cd, and dvd thing, nothting that says anyhting else besides SCHP-30001. What does diagnosis do, woudl that determine anything?